Jetpack

Two water-powered jetpacks are available for public use in Singapore thanks to Hawaiian Christina Tran, who brought SeaBreeze, her home state's watersports franchise, to the city in 2013.

"It can take you up to 10 meters high," says Tran. "I think it's the safest way to fly, as you have the power to control your flight."

When I slapped the jetpack on my back and headed out to sea, I could feel the jealousy emanating from all eyes on the beach -- until those curious spectators saw me struggling for the good part of an hour.

This one isn't easy.

"The first step is always the most difficult," said Alred Low, SeaBreeze business partner/instructor. "You cannot fight the machine, and you have to find your center of balance."

"Once you can balance then you can fly just by pressing a button -- like in a cartoon," said Low.

Conclusion: You'll have to conquer your fear of drowning before you tackle your height issues.

iFly Singapore

iFly is the largest indoor skydiving simulator in the world.Average heart rate: 96 bpm

Maximum heart rate: 116 bpm

Nausea level: 1/5

"I never thought I could fly for a living until I saw a hiring notice from iFly Singapore in 2010," says Joshua Tay, one of the instructors at iFly Singapore. "I quit my job right away to join."

iFly Singapore launched in May 2011.

With a height of about 17 meters and a width of five meters, it's the world's largest indoor skydiving simulator.

The wind tunnel can accommodate 20 professional flyers at one time.

There are four fans in the tunnel generating airspeeds of up to 300 kilometers per hour. But, according to iFly Singapore, usual body-flight speeds range from 160 to 190 kilometers per hour.

It looks easy, but striking the right balance is challenging.

"It's actually more difficult than skydiving outdoors, because you're confined in the tunnel," said Tay. "The first time I skydived for real [after training with iFly Singapore], I was flying better than many seasoned flyers."

The first two flights are mostly about learning to balance.

Once you've mastered that, an instructor will help you catch enough wind to soar up to nine meters, offering a great way to experience the weightlessness of free falling.

Conclusion: This is the best way to train before jumping out of a plane.

ClimbMax

The ClimbMax sent me on a 45-minute journey of self-questioning, regret and skyrocketing heartbeats, followed by immense joy when I felt my feet touch something solid.

On the top of Sentosa's largest hill, the rope course consists of three levels, with heights up to 12 meters.

Knowing I was safely secured and seeing 12-year-olds enjoying the course a level below me didn't do much to calm me, particularly when I reached a section that involved jumping across a gap between platforms.

At that moment, my heart raced to 177 bpm.

In the end, I couldn't finish -- I didn't have the strength, nor courage, to continue to the highest level.

Conclusion: This is an intense exercise to combat fear of heights. And embarrassing if you're concerned with what those on the ground below are thinking as they watch you struggle.

ParaJump

In my defense, this one involves strapping into a harness and trusting the safety wire to keep you from splattering to the ground at the end of a 50-foot freefall parachute jump.

"A woman from the UK was trying ParaJump," says Hafiz Hanafiah, an instructor in the MegaZip Adventure Park. "She stood on the platform for 45 minutes before finally daring to jump. After she made that jump, she hugged me and thanked me for being there for her the whole time. It was very memorable for me."

Hanafiah says that before he joined the company, he was afraid of heights as well.

"Since then, I took a leap every day from ParaJump until I overcame the fear."